Preparation, Enforcement, and Comparison of Internationalized Strings Representing Usernames and Passwords
draft-ietf-precis-saslprepbis-09

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PRECIS                                                    P. Saint-Andre
Internet-Draft                                                      &yet
Obsoletes: 4013 (if approved)                                A. Melnikov
Intended status: Standards Track                               Isode Ltd
Expires: April 26, 2015                                 October 23, 2014

 Preparation, Enforcement, and Comparison of Internationalized Strings
                  Representing Usernames and Passwords
                    draft-ietf-precis-saslprepbis-09

Abstract

   This document describes methods for handling Unicode strings
   representing usernames and passwords.  This document obsoletes RFC
   4013.

Status of This Memo

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   provisions of BCP 78 and BCP 79.

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   This Internet-Draft will expire on April 26, 2015.

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   Copyright (c) 2014 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

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Saint-Andre & Melnikov   Expires April 26, 2015                 [Page 1]
Internet-Draft       PRECIS: Usernames and Passwords        October 2014

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Usernames . . . . . . . . . . . . . . . . . . . . . . . . . .   4
     3.1.  Definition  . . . . . . . . . . . . . . . . . . . . . . .   4
     3.2.  Preparation . . . . . . . . . . . . . . . . . . . . . . .   5
     3.3.  Enforcement . . . . . . . . . . . . . . . . . . . . . . .   5
     3.4.  Comparison  . . . . . . . . . . . . . . . . . . . . . . .   6
     3.5.  Case Mapping  . . . . . . . . . . . . . . . . . . . . . .   6
     3.6.  Application-Layer Constructs  . . . . . . . . . . . . . .   7
     3.7.  Examples  . . . . . . . . . . . . . . . . . . . . . . . .   7
   4.  Passwords . . . . . . . . . . . . . . . . . . . . . . . . . .   9
     4.1.  Definition  . . . . . . . . . . . . . . . . . . . . . . .   9
     4.2.  Preparation . . . . . . . . . . . . . . . . . . . . . . .  10
     4.3.  Enforcement . . . . . . . . . . . . . . . . . . . . . . .  10
     4.4.  Comparison  . . . . . . . . . . . . . . . . . . . . . . .  11
     4.5.  Examples  . . . . . . . . . . . . . . . . . . . . . . . .  11
   5.  Migration . . . . . . . . . . . . . . . . . . . . . . . . . .  12
     5.1.  Usernames . . . . . . . . . . . . . . . . . . . . . . . .  12
     5.2.  Passwords . . . . . . . . . . . . . . . . . . . . . . . .  13
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  14
     6.1.  UsernameIdentifierClass . . . . . . . . . . . . . . . . .  14
     6.2.  PasswordFreeformClass . . . . . . . . . . . . . . . . . .  15
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .  15
     7.1.  Password/Passphrase Strength  . . . . . . . . . . . . . .  15
     7.2.  Identifier Comparison . . . . . . . . . . . . . . . . . .  15
     7.3.  Reuse of PRECIS . . . . . . . . . . . . . . . . . . . . .  16
     7.4.  Reuse of Unicode  . . . . . . . . . . . . . . . . . . . .  16
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  16
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .  16
     8.2.  Informative References  . . . . . . . . . . . . . . . . .  16
   Appendix A.  Differences from RFC 4013  . . . . . . . . . . . . .  18
   Appendix B.  Acknowledgements . . . . . . . . . . . . . . . . . .  18
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  19

1.  Introduction

   Usernames and passwords are widely used for authentication and
   authorization on the Internet, either directly when provided in
   plaintext (as in the SASL PLAIN mechanism [RFC4616] or the HTTP Basic
   scheme [RFC2617]) or indirectly when provided as the input to a
   cryptographic algorithm such as a hash function (as in the SASL SCRAM
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